Method of packaging multichannel optical receiver module having a sub-mount with an optical block to guide incident parallel light beams and package of the same

Abstract

A method of packaging a multi-channel optical receiver module and a package of the same are provided. The method includes installing a first lens on a sub-mount; aligning an optical block including a plurality of filters on the sub-mount; installing the aligned optical block on the sub-mount; aligning a second lens on the sub-mount; installing the aligned second lens on the sub-mount; and coupling the sub-mount to a TO-stem. The aligning of the optical block transmits light incident through the first lens to the plurality of filters, transmits light beams transmitted through the plurality of filters to an object lens, monitors positions of and intervals between the light beams transmitted through an infrared (IR) camera and aligns the optical block so that the intervals between the light beams transmitted through the plurality of filters are identical.

What is claimed is: 
     
       1. A method of packaging a multi-channel optical receiver module, comprising:
 installing a first lens on a sub-mount; 
 aligning an optical block including a plurality of filters on the sub-mount; 
 installing the aligned optical block on the sub-mount; 
 aligning a second lens on the sub-mount; 
 installing the aligned second lens on the sub-mount; and 
 coupling the sub-mount to a TO-stem, 
 wherein the aligning of the optical block transmits light incident through the first lens to the plurality of filters, transmits light beams transmitted through the plurality of filters to an object lens, monitors positions of and intervals between the light beams transmitted through the object lens using an infrared (IR) camera, and aligns the optical block so that the intervals between the light beams transmitted through the plurality of filters are identical. 
 
     
     
       2. The method of  claim 1 , wherein the aligning of the second lens comprises aligning the second lens so that the light beams transmitted through the plurality of filters are incident on the center portion of the second lens. 
     
     
       3. The method of  claim 1 , wherein the installing of the optical block on the sub-mount and the installing of the first lens and the second lens on the sub-mount comprises installing the optical block, the first lens, and the second lens on the sub-mount using epoxy. 
     
     
       4. The method of  claim 1 , wherein the coupling of the sub-mount to the TO-stem comprises:
 inserting a head portion of the TO-stem into a hole penetrating through the sub-mount from one side surface to the other side surface of the sub-mount; and 
 sealing the hole of the sub-mount into which the head portion of the TO-stem is inserted using the epoxy. 
 
     
     
       5. An optical receiver module package comprising:
 a TO-stem including a base, a plurality of optical receiver devices installed on the base so that intervals between light beams output through second lens are identical and configured to receive the light beams having wavelengths different from each other, a head portion formed on the base to be inserted into and coupled to sub-mount, and one or more lead pins configured to penetrate through the base; and 
 the sub-mount including a first lens transmitting light having various wavelengths which are incident as parallel light beams, an optical block configured to guide the parallel light beams, a plurality of filters coupled to the optical block and configured to transmit only a specific wavelength among the guided parallel light beams and reflect the remaining wavelengths, and a second lens aligned to correspond to each of the plurality of optical receiver devices and configured to focus the light beams transmitted through the filters. 
 
     
     
       6. The optical receiver module package of  claim 5 , wherein the first lens is a collimating lens, and the second lens is a coupling lens. 
     
     
       7. The optical receiver module package of  claim 5 , wherein one side surface of the sub-mount is flat, and the other side surface has a round semicircular shape, and
 a hole penetrating through the sub-mount from one end surface to the other end surface of the sub-mount is formed at the one end surface and the other end surface of the sub-mount. 
 
     
     
       8. The optical receiver module package of  claim 7 , wherein the hole and the head portion have oval shapes, and the head portion is inserted into and coupled to the hole. 
     
     
       9. The optical receiver module package of  claim 5 , wherein the optical block includes a transparent body, an anti-reflective layer, and a total reflection layer, and
 the total reflection layer totally reflects light reflected by the first filter among the plurality of filters to the second filter.